| APA | PTDM. (2012, February 16). In Acronym Geek. Retrieved 23:21, February 16, 2012, from http://www.acronymgeek.com/PTDM |
| MLA | "PTDM." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PTDM>. |
| MHRA | 'PTDM', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PTDM> [accessed 16 February 2012] |
| Chicago | "PTDM", http://www.acronymgeek.com/PTDM (accessed February 16, 2012). |
| CBE/CSE | PTDM [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PTDM. |
| Bluebook | PTDM, http://www.acronymgeek.com/PTDM (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTDM, http://www.acronymgeek.com/PTDM (optional description here) (as of Feb. 16, 2012, 23:21). |
| AMA | PTDM. Acronym Geek. February 16, 2012, 23:21. Available at: http://www.acronymgeek.com/PTDM. Accessed February 16, 2012, 23:21. |